Process for making basic steel in open-hearth steel-furnaces



v c. H; F. BAGLEY. PROCESS FOR MAKING BASIC STEEL IN OPEN HEAR'TH STEEL- FURNMKS.

- APPLICATION FILED SEPT. 19, I9l8- .1,32s,-s03.- I Patented Jan. 27, 1920' 2 five/170% Y l 3 I I interruptedwhile 1 but when, after Durham,

rm "To CHARLES HENRY FROST BAGLEY, OF STOCKTON-UPON-TEES, ENGLATWI).

PROCESS FOR MAKING BASIC STEEL IN GEEK-HEART STEEL-FURNACES,

Specification of Letters Patent.

latented J an. 2'2, 1920,

Application filed September 19, 1918. Serial No. 254,750.

To all whom it may concern:

Be it known that 1, CHARLES HENRY Fnos'r BAGLEY, of Cleveland House, Hartburn, Stockton-on-Tees, in the county of England, metallurgical engineer, have invented certain new anduseful improvements in Processes for Making Basic Steel in Open Hearth- Steel Furnaces, of which the following'is a specification.

This invention relates to the manufacture of basic steel in fixed open-hearth furnaces. The slag which is formed on the top of the mass of molten metalis removed. from time to time by means of a blast or blasts of fluid, preferably heated air or superheated steam. After such removal, further additions of lime or oxids are made.

According to this invention, the diiiicuh ties experienced, in removing the slag fror a fixed furnace are entirely overcome, and.-

where dry steam or other hot blast is em-- ployed, no serious chillin effect of the blast is incurred as regards the slag, metai and brickwork. By removing the slag in accord the weight of metalmay he increased I ance with the invention, charged into the furnace and a greater quantity of steel. reduced at each heat, thereby enlarging t e capacity and increasing the output of the furnace After the slag is removed by the blast, the process proceeds withgreater rapidity, as there is not onl a less quantity of slag to be heated to the nal temperature of the steei, but also a less thickness of slag, which is a 001- conductor of heat, separating the flame roni the metah v i y .The steel melting process is tempdrarily the removal of the slag,

small fresh quantities of lime or oxide are added, they act upon the metal with greater" rapidity and vigor than would otherwise he the case; so taat the process as 'a'whole is considerablyexpedited,

"Moreover, a single steam or air-compressing plant is sufii-ient for, and may be common to,

an indefinite number-of furnaces, and the exnense thereof, will be pro portionately distrlbuted,

vThe accompanying drawing illustrates, by way of example, an arrangement of apparatus for. practising the invention, the

, view being a vertical cross section through taken in the plane slag outlets. a is the openthe open-hearth furnace of one of the blast twyersand Referring to the drawlng,

the slag is being, removed;

hearth furnace, represents molten metal and c the layer of slag thereon, d represents one of a series of twy'ers disposed at suitable intervals along the length of the furnacea at one side thereof, and supplied from an air blast trunk 6 connected to a blowing engine or the like. lhe twyers "are made of any suitable refractory material or may be of water cooled construction, as will be well understood without further illustration, and are arranged to discharge at about the'level of the slag.

At suitable intervals along the length of the other side of the furnace, slag outlets or notches f of usual type, are provided at positions such that when the blast is turned on to the twyers the slag is blown across the furnace and flows out through the outlets ordoorways f.

instead of using an air b'last as illus trated, a blast of steam may be used for the purpose, suitable nozzles and steam pipes being employed instead of the air twyers and air trunk.

It wiil also be understood that simple.

perforations may be provided at a suitable angle in the brickwork, to form the blast nozzles or outlets. V

Generally it is understood that I d0- not confine myself to the particular means de scribed-for carrying out the invention but vary the same in detail, within the sp rit of theinveution.

What i claim as my invention and desire to secure by Letters Patent is 1. An improved process of manufacturing basic steel in fixed open hearth furnaces characterized in that the surface of metal is maintained somewhat below the lower edge of the slag holes, the slag; is removed from time to time through a plurality of slag holes by means of a series of blasts of I iiuld acting only on a relatively small area of the surface of the metal and issuing from a plurality of twyers inclined at a suitahie angle to thehorizontal, and clear from close contact with the molten metal, after which further additions of lime and oxide are made which then act with great vigor and rapidity on the remaining impurities in the meta 2. An improved process of manufacturing basic steel in fixed open hearth furnaces.

characterized in that the surface of metal is maintained somewhat below the lower edge of the slag holes, the slag is removed from time to time through a plurality of slag holes by means of a series of blasts of heated iiuid acting only on a relatively small area of the surface of the metal and issuing from a plurality of twyers inclined at a suitable angle to the horizontal, and clear from close contact with the molten metal, after which further additions of lime and oxide are inadewhich then act with great vigor and rapidity on the remaining impurities in the metal. v

3 An improved process of manufacturing basic steel in fixed open hearth furnaces characterized in that the surface of metal is maintained somewhat below the lower edge of the slag holes, the slag is removed from of the surface of the metal and issuing from a plurality of twyers inclined at a suitable angle to the horizontal, and clear from close contact with the molten metal, after which further additions of lime and oxids are made which thenact with great vigor and rapidity on the remaining impurities in the metal.

In testimony whereof I have signed my name to this specification.

CHARLES HENRY FROST BAGLEY- 

